Honing tool



July 29, 1947.

M. N. PRANQE HONING TOOL Filed May 11, 1944 2 Sheets-Sheet 1 FIGJ.

FIGB.

FIG].

mmvroa E G N A R P N E C. R U A M ATTORNE YS July 29, 1947. M. N. PRANGE I HONING'I'OOL F led-Ma 11.11944 2 Sheets-Sheet 2 INVENTOR.

- I MAURICE N.PRANGE' ATTORNEYS Patented July 2 9, 1947 UNITED STATES OFFICE HONING ro-on Maurice N. Prange, Highland- Park, Mich. Application May 11, 1944;. Serial No. 535,122

the type employed for the honing or engine cylinders and for similar work.

It is the primary object of the invention to obtain a construction which is suitable for honing small diameter cylindrical surfaces such, for instance, as adiameter of 1% of an inch.

It is a further object to obtain means forholding the abrasive members or stones-whichzwill permit of adjustment of the same during the continuance of the honing operation. With these objects in view the invention consists in the constructi'on as hereinafter set forth.

In the drawings:

Fig. l is a central longitudinal section. partly in elevation through my improved honing tool;

Fig. 2 is a cross section on line 22. Fig. 1

Fig. 3 is a similar view on line 3-3., Fig. 1;

Fig. 4 is a longitudinal section through one of the stones;

Fig. 51s a cross section thereof;

Fig. 6 is a plan view thereof;

Fig. 7 is a side elevation of one of the cam members detached; 1

Fig. 8'is a plan view thereof;

Fig. 9 is a section on line 9-9, Fig. 1;

Fig. 10 is an elevation of the members in Fig. 9; and

Fig. 11 is an elevation of the tool.

Many constructions of honing tools which are used for large diameter work, such as engine cylinders, are not adapted for small'diameter work. This is for the reason that there is not sufficient available space for the elements of the structure which requires redesigning the same. In particular,- the abrasive elements or stones must'be of very small dimensions, must be securely held in position during the performance of the work and capable of adially outward adjustment. To comply with such conditions, I have devised the following construction. A is a cylindrical body member of a diameter less than thatof theibore to be honed being provided at one end with the reduced diameter threaded portion B for engagement with a threaded socket C of the rotary shaft D. The member A has formed therein a plurality of longitudinally extending channels E and is further provided with a plurality of longitudinally spaced annular bands F surrounding .and secured to the same. The spaces between these bands and within the channels E are adapted to receive the abrasive members or stones G. Each of these is provided with holding means comprising a fiexiblemember H preferably of fabric which is cemented to the bottom and one side of the stone. Portions H and H of this fabric extend beyond the opposite ends of the stone, the portion H having an aperture H therethrough for engaging shown pin F extending radially inward from one of the bands F. This will hold the stone from longisprains. (Casi-3184.3)

t'udinal movement while permitting radial movement. Within each of the channels E and inside "of the stones G is a longitudinally extending cam member I. This is fashioned to cooperate with I the. stones G forming a supporting bearing therefor and a meansfor efiecting a radially outward adjustment. As shown, the member I is provided with inclines or wedge faces I for engaging correspondingly inclined bottom faces of the stones G. Also, to form a firm support or abutment. for the stone holding the same from any rocking movement, the center portion of the member I is. channeled or. cut away at I leaving a pair of laterally spaced wedge faces I" for each of the stones G. Within the channel I is secured a spring finger J which bears against the project- 'in'gportion H of the holder to retain the same and the-stone within the channel E. I

To provide for adjusting the stones during the continuance of the honing operation, I have provided. means for moving the members I longitudinally'ih the channels E while the holder A is rotating. This. means comprises a collar K surrounding. the inner end portion of the member A slightly reduced in diameter to form a shoulder K; the collar being. arranged between this shoulder and the socket, C. The inner surface of the collar is screw-threaded to engage threaded portions I on the inner ends of the members I so that rotation of the collar will eflect a simultaneous longitudinal adjustment of all of the memhers I. A collar L is externally mounted on the socket member C, and is secured thereto by radially extending pins M passing outward through inclined slots L ,in. the :collar. Springs L are placed; in thesesl'otstoabut against the pins M normallyholding the collar in fixed position on the member C but permitting a limited relative rotary'adjustment by compressing the springs L The collar L'is further provided with one or inore pawls N for engagingan annular series of ratchet teeth. Q onrthe collar K. The arrangement is suclrthat whenthe collar L is relatively rotated in a direction to compress the springs L the pawls N will be; engaged with the registering ratchet teeth 0 and will rotate the collar K. However, the return movement of the collar L by the reaction of the spring L will disengage the pawls from the ratchet teeth without imparting; any reverserotary movement to the collar K. With the construction as described, When the tool isen'gaged with the bore to be honed, the stones Gare: sufliciently withdrawn radially in- Ward to permit of such engagement. They may then be adjusted radially'outward by successive oscillatory movements of the collar L, .each' of which-.will rotate the collar K and through the threads: I willmove the cam members I longitudinally'in the channels E. This will cause the wedge portions I to move the stones H outward to further adjust the stones radially outward, this may be accomplished without stopping the rotation as the operator may merely place his hand in contact with the outer surface of the collar L frictionally retarding the same. This will effect a relative rotation of the collar on the socket member C and through pawls N and ratchet teeth will produce a similar relative rotation of the collar K. When the hold on the collar L is released the spring L will return it to normal position after which the operation may be repeated if necessary. It will be understood that the outer faces of the stones H are cylindrical segments corresponding to the cylindrical surface which is honed and, by reason of the spaced wedge bear-v ings I, the abrasive face of the stone is held concentric with the axis of the tool. What I claim as my invention is: V V l. A honing tool comprising a longitudinally channeled rotary holder, an abrasive stone, in said channel, a longitudinally movable cam member in said channel forming a backing for said abrasive member, an apertured fabric tab directly secured to and projecting beyond one end of said abrasive member, and a detent on said holder for engaging the aperture of said tab to hold said abrasive member from longitudinal movement while permitting radial movement by said cam. 2. In a honing tool, the combination with a longitudinally channeled rotary holder and a cam member longitudinally movable in said channel, of an abrasive stone provided with a flexiblefabric tab directly secured thereto and projecting beyond an end thereof, and a detent on said holder engaging said tab to hold said stone from longitudinal movement while permitting radial adjustment by said cam member. i

3. In a honing tool, the combination with a longitudinally channeled rotary holder and a longitudinally movable cam member in said channel, of an abrasive stone also engaging said channel and provided with a flexible member secured to the inner lace thereof and projecting beyond the opposite ends to form tabs, a detent on said holderfor engaging one of said tabs to hold said stone from longitudinal movement and a resilient member on said cam for engaging the other tab. 4. In a honing tool, the combination with a longitudinally channeled rotary holder and a l tudinally movable cam member insaid channel, of an abrasive stone, a fabric member secured to one face and one side of said stone and projecting beyond the ends thereof to form flexible tabs, one having an aperture therein, a de tent on said holder for engaging said apertured tab and a resilient finger on said cam member for engaging the other tab.

5. In a honing tool, the combination with a rotary holder having a plurality of circumferentially spaced longitudinally extending channels therein, of an abrasive stone in each of said channels anchored against longitudinal movement while permitting radial movement, a longitudinally movable cam member in each of said channels eccentric to the axis of said rotary member forming a backing for said abrasive stone, the end of said cam member being transversely threaded, a collar on said rotary holder threadedly engaging the threaded ends of all of 4 said eccentric cam member, and means for relatively rotating said collar on said holder during the rotation of the latter to adjust said cam member longitudinally and said stone radially.

, 6;j-A .honing tool comprising a rotary cylindrical lioldr having a plurality of longitudinally extending channels therein, longitudinally spaced "zbands surrounding and secured to said holder,

abrasive stones located in said channels in the spaces between said hands, a flexible apertured tabsecured to and projecting beyond one end of each stone beneath the adjacent band, an in wardly projecting detent on said band engaging said-aperture, a cam member extending longitudinally in each of said channels forming a backing for the stones therein, the inner ends of said cam members having transverse threads on the outer faces thereof, a collar surrounding said cylindrical holder internally threaded to engage the threads on said cam members, and means operable during the rotation of said tool for relatively rotating said collar to simultaneously adjust said cam members longitudinally in said channels effecting the radially outward adjustment of said stones.

7. In a honing tool, the combination with a longitudinally channeled rotary holder, of a member longitudinally movable in said channel provided with laterally spaced cam portions, an abrasive stone also in said channel seated against said laterally spaced cam portions to be held thereby against rocking, flexible means for holding said stone from longitudinal movement in said channel while permitting radial movement, and means for adjusting said first mentioned 1 member longitudinallyto efiect said radial movement of the stone.

-8. A honing tool comprising a rotary cylindrical holder having a plurality of longitudinally extending channels therein, a plurality of spaced annular bands surrounding and secured to said holder, a longitudinally extending member within each of said channels provided with laterally spaced cam portions opposite each space between saidbands, an abrasive stone within each channel-in-the space between said bands, a flexible member-secured to the under face of each stone and projecting beyond opposite ends thereof to form'tabs, one of said tabs being apertured and extending beneath the adjacent band, a detent on said band engaging said aperture, a resilient finger secured to said longitudinall extending member and bearing against the oppositely extending'tab to hold the stone against said cam portions, the lateral'spacing of which hold said stone against rocking, and means for adjusting said longitudinally extending members longitudinallywithin said channels to effect the simultaneous radially-outward movement of said stones. J MAURICE N. PRANGE.

' REFERENCES CITED The following references are of record in the flle' of this patent:

V UNITED STATES PATENTS Number Name Date 2,265,377 Kline Dec. 9, 1941 1,689,589' Hutto Oct. 30, 1928 2,102,092 1 'Quigley Dec. 14, 1937 2,283,132 Wommer May 12, 1942 FOREIGN PATENTS Number Country Date 267,922 Great Britain Dec, 8, 1927 

